Warhammer 40k Animation Project Concept art

anyone know any good animation program? I'm planning to do a Warhammer 40k animation series call Heretek. Basically it is about an Imperial guard who committed Tech Heresy on the battlefield in order to survive. As a result he is branded a Renegade therefore he was force to flee into a Hive City. I know it doesn't look to pro but I gotta keep the detail to a minimum since I'll have to draw the characte 1000x so here are the first concept art: